Ventilator.



J. CHRISTIE, DEGD. A. J. & B. R. CHRISTIE, EXEOUTOES. VENTILATOR.

APPLICATION FILED MAY 29, 1911.

1,073,079. Patented Sept. 9, 1913.

rinrrnn STATES PATENT onrrcn JAMES CHRISTIE, OF PHILADELPHIA, PENNSYLVANIAyALEXANDER J. CHRISTIE AND ELIZABETH R. CHRISTIE EXECUTOES OE SAID JAMES CHR-JETIE, DECEASED.

VENTILATOB.

Specification of Letters Patent.

Patented Sept. 9,

, Application filed May 29, 1911. Serial No. 623,888.

To all whom it may concern; 1

Be it known that" I, Janus CHRIST E, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Ventilators, of which the following is a specification.

One object of my invention is to provide a form of ventilator particularly adapted to chimneys or other parts of abuilding from which it is'desired towithdraw air, which shall have its partsso arranged as to be relatively efficient in action, although of a simple and compact construction.

Another object is to, provide a ventilating structure which will act to so guide or defleet. the air currents of the atmosphere that their final resultant direction of flow will be toward the outlet of the ventilating structure and will exercise a maximum aspirating action on the bodies of air in the main conduit. 1 4

These objects and other advantageousends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which the figure is a vertical section of a ventilator constructed according to my invention.

In the above drawing 1 is the central cylindrical conduit portion of the ventilator which is connected to or mounted upon the chimney or body of a building from which it is desired to aspirate the air. Connected directly to and extending downwardly and outwardly from the upper edge of this part 1 is a conical deflector having two portions 2 and 3; the straight lines of the surface of the latter of these parts being at about an angle of 30 to the center line of the central conduit 1, while the lines of the surface of the part 2 are inclined at about an angle of to this same center line.

The length of the conical surface of the part 3 is relatively short as compared with the surface of the part 2, being preferably, though not necessarily, about one-third the length of the same. A second conical deflector 4 is carried from the deflector 2--3 by means of vertical radially extending webs 5. This second deflector is so formed that the lines of the main portion of its surface are inclined at an angle of about 120 to the center line of the main tubular portion 1 and therefore at an angle of about 60 to the lines of the surface of the part 2.

The second deflector extends upwardly and outwardly from a circle spaced away from the middle part of the portion 3 of the first deflector so as to provide an annular passage; it being obvious from the foregoing description that the lines of the surface of the deflector i are substantially at right angles to the lines of the surface of the part 3. The outer upper edge of the second deflector 4: is curved'upwardly so as to terminate at about the same distance from the center line of the ventilator as does the first deflector.

A cap structure 8 is mounted centrally over the'main tubular portion 1 and it may be described as formed by two substantially conical structures joined base to base, although the surface of the under structure 6 is somewhat concaved'and its extremities are curved upwardly to provide a waterretaining gutter, in combination with the base portion of the upper conical structure 7. Suitable drainage means may be provided for carrying off the water collecting in this gutter and it will be noted that the dimensions of the structures 6 and 7 are such that they extend well over the upper edge of the main central conduit 1 and at such a distance therefrom as will effectually prevent the entrance of rain or snow. This cap structure 8 is supported from the central conduit 1 by suit-ably placed ribs or brackets which may take the form of radial plates similar to the plates 5 and which, like them, will serve to direct the air currents flowing toward the ventilator in such a manner as to keep them from whirling or eddying.

lVith the particular arrangement of parts shown, currents of air flowing toward the ventilator in the direct-i011 of the arrow, strike the two surfaces 2 and 4 from which they are deflected in such direction that their resultant current is directed toward the narrow portion of the annular cavity between these two surfaces. The main portion of the air current strikes the conical surface 3 and entrains or carries with it the deflected portions heretofore referred to, being in turn deflected from said surface 3 into the space between the inner surface of the part a and the concave conical surface 6, and flowing in a line directed toward the outlet. The general line of flow of this deflected air current being upward and outward, it necessarily aspirates or draws outtop of the ventilator between the upper edges of the parts 4 and 6.

I have found by actual test that with the arrangement of parts illustrated and described, a most efficient ventilating action is obtained and this I believe to be due to the" combination of the deflecting surfaces 2, 3 and 4, so that they are caused to act as described.

While I preferably so design andmount the Various parts of my improved ventilator that they lie at the angles specified relatively to each other, it is obvious that slight variations from said angles may be made without departing from my invention, since the apparatus would still embody thevaluable features thereof through operating at a lowered eflicienoy. V I

I claim:

A ventilator consisting of a central conduit; two annular deflectors surrounding said conduit; one of said deflectorsconsisting of two conical parts connected to each other and so arranged that the lines of the surface of the first part are at angle of approximately 30 to the line of the conduit while the lines of the surface of the second part are atan angle of approximately 60 c to said line of the conduit; the lines of the surface of the second deflector being at an angle of approximately 60 to the lines of the surface of the second part of the first de- .flector; and the inner edge of the second deflector being spaced away from and below the top of the firstdefiector to provide an I annular opening adjacent the middle of the first part of the first deflector; with a cap in the form of two substantiallyconical structures'joined base to base mountedover and projecting beyond the sides of the-central conduit,'the under part of said cap coacting with the second annular deflector to form ail-annular upwardly inclined pas:

- sage.

In testimony whereof, I have signedmy name to this specification, in the presence of two subscribing witnesses. 4 A p y JAMES CHRISTIE.

Witnesses: V

'WILLIAM E. BRADLEY,

WM. A. BARR.

Copies of this patent may be obtained for five cents each, by addressing' the Commissioner of Patents,

' Washington, D. C. V 

